| PSProminent Systems INC | City of Industry | CA | Primary Metal Manufacturing331311 | — | ◇ UNVERIFIED |
| PDProtech Design | Anaheim | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| PWPutzmeister West INC | Santa Fe Spgs | CA | Primary Metal Manufacturing331411 | — | ◇ UNVERIFIED |
| QAQuailty Automotive | Westminster | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
 Quality Aluminum Forge INC | Long Beach | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| QFQuantum Fuel Systems Technologies INC | Lake Forest | CA | Primary Metal Manufacturing331513 | — | ▲ REPORTED CLOSED |
| QQQuick Quack Car Wash Coe | Roseville | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| RFRain for Rent INC | Woodland | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| RORamcast Ornamental Supply CO INC | Fresno | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RFRamirez Foundry | El Cajon | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RDRangers Die Casting CO | Lynwood | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RHRaymond Handling | Santa Fe Springs | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| RSRecycling Services Alliance, I | Fremont | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| RSRelativity Space INC | Inglenook | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RSReliable Steel Building Products INC | South Gate | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| RSRenco Systems INC | Banning | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| RTRennsteig Tools INC | Camarillo | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| REReuland Electric CO | Industry | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RMRichard Macdonald Studios INC. | Monterey | CA | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| RFRidge Foundry INC | San Leandro | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| RIR&k Industrial Products INC | Richmond | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| RMRoto Metals, INC | San Francisco | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| RSRoy S. Waisman | Palmdale | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| RWRt Welding | Hesperia | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RARucker and Kolls INC | Milpitas | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SDSan Diego Refining CO | Escondido | CA | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| SCSanta Clara Windustrial | Fremont | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SRSanta Rosa Lead Products LLC | Ontario | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SESaratoga Energy Research Partners | Berkeley | CA | Primary Metal Manufacturing331311 | — | ◇ UNVERIFIED |
 Schlosser Forge Company Rancho Plant #2 | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SSScott Schmitt | Rocklin | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| SISearing Ind | Rancho Cucamonga | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SPSeaward Products INC | Chatsworth | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| SBSequoia Brick | Lindsay | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| SESharon Escoto | Hesperia | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| SPShawcor Pipe Protection LLC. | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SHS & H Welding INC Dba S & H Metals | Sacramento | CA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| SASierra Alloys Company | Azusa | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| SASierra Aluminum Architectural | Fontana | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| SASierra Aluminum, Div of Samuel, Son & CO | Riverside | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SASierra Aluninum Fontana Extrusion Operation | Fontana | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SDSierra Design & Manufacturing | Modesto | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SRSkees Recycling | Fresno | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| SMSmart Machining, LLC | Santa Clara | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SWSmart Wires INC | Union City | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SSSmt Sales INC Dba Tom's Mobil Welding | Santa Paula | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| SMSnl-iov Montclair Owner LLC | Montclair | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
 So-cal Value Added LLC | Camarillo | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SISolcoa Industries | Alameda | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SESolo Enterprise CORP | City of Industry | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
